GCN Circular 34746
Subject
LIGO/Virgo/KAGRA S230920al: Updated Sky localization
Date
2023-09-20T17:06:10Z (a year ago)
From
naresh.adhikari@ligo.org
Via
Web form
The LIGO Scientific Collaboration, the Virgo Collaboration, and the
KAGRA Collaboration report:
We have conducted further analysis of the LIGO Hanford Observatory
(H1) and LIGO Livingston Observatory (L1) data around the time of the
compact binary merger (CBC) candidate S230920al (GCN Circular 34741). Parameter estimation has been
performed using Bilby [1] and a new sky map, Bilby.multiorder.fits,0,
distributed via GCN Notice, is available for retrieval from the
GraceDB event page:
https://gracedb.ligo.org/superevents/S230920al
For the Bilby.multiorder.fits,0 sky map, the 90% credible region is
2180 deg2. Marginalized over the whole sky, the a posteriori
luminosity distance estimate is 3139 +/- 1003 Mpc (a posteriori mean
+/- standard deviation).
For further information about analysis methodology and the contents of
this alert, refer to the LIGO/Virgo/KAGRA Public Alerts User Guide
https://emfollow.docs.ligo.org/userguide/.
[1] Ashton et al. ApJS 241, 27 (2019)